Patent GB-226270-A (GB)
Title: Improvements in or relating to the casting of metals
IPC: B22D21/00
Filed: 1923-09-17
Abstract: 226,270. Wade, H., (United Engineering & Foundry Co.). Sept. 17, 1923. Casting processes; casting-machines; moulds.- A casting-machine designed particularly for non- ferrous metals such as zinc although applicable to other metals comprises means such as an endless chain for delivering a. mould or a series of moulds from a charging station to a discharging station, means intermediate said stations for retarding the dissipation of heat from portions of the moulds (e.g. a heat-retaining hood) or means for supplying heat to said portions and means for cooling the lower portions of the moulds. The moulds 5 have projections 9 engaging rollers on chains 2 which convey them to. guides 13 along which they are advanced separately by slides 18 reciprocated by links 16 and arms 15 oscillated by a rotating crank. The arms 20 of the slides, Fig. 4, which engage the moulds are pivoted and weighted so as to pass beneath the moulds on the return stroke. The moulds are received at the pouring station B by supports 26 mounted on a balance arm 27 which indicates the quantity of metal poured, and are then pushed on to a platform 29 mounted on a lever 30 and held in the elevated position shown by a catch 33. When the mould has been positioned a lug 34 on the front slide releases the catch and the mould descends until a pair of depending threaded projections 43, Fig. 1, engage screwed spindles 37. A catch 35, Fig. 4, retains the platform in the lower position until the mould has been removed bv the screws whereupon the front of the mould releases the catch and a weight 32 returns the platform. The moulds are advanced by the screws under an insulating hood 47, Fig. 1, which may contain burners 48, while depending fins 45<1>, Fig. 8, on the mould enter a cooling trough 44<1>. In a modified form, Fig. 8, the screws 37<1> extend beyond the pouring station and the moulds are raised out of contact with them during pouring by lifting-rods 57 driven by worm gearing and a motor 55 on the balance arm 27<1>. In this form the moulds have lateral lugs 9<1> engaged by rollers on the chains and the rate of flow of cooling water is regulated by an overflow pipe 61 connected to the discharge pipe 60. The chains 2, Fig. 1, after leaving the moulds, travel along a lower guide 49 and receive the cooled moulds when they leave the ends of the screws. The sprockets 6 for the chains and the crank for operating the arms 15 are driven through gearing from two motors which are either synchronous or are automatically controlled so as to rotate in synchronism. The moulds, which deposit the ingots at D, are returned by the chains along guides 10 and under a hood supplied with heating means. Castings, extracting.-The ingots fall from the moulds on to arms pivoted at 50 from which they are automatically discharged, the arms being returned by weights 51. Metal-pouring.-The metal is preferably heated in an electric furnace containing resistances R, Fig. 8, and lined with refractory material. A cover 64, which closes the furnace at all times, carries one or more thermo-couples 65. The outlet opening 66 is controlled by a hand-operated plug 67 and the metal enters the mould through a spout 69 which may be heated by a burner 70. The furnace is so designed that in the event of the plug or outlet requiring repair it may be rotated about the pivot 63 to remove molten metal from the outlet.